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<h2><b>abs</b></h2><p>

<code>abs(<i>expr</i>)</code><p>

Takes the absolute value of the result of <code><i>expr</i></code>.
Operates on both gridded and station data. Missing data values do not
participate. 
<H3>Usage Notes</H3><P>
<H3>Examples</H3><P>
